Full
Outline
A large hub to hub ratio model stage is proposed to address the issue of the existing conventional hub to hub ratio model stage for domestic compressors being unable to meet the rotor stability requirements of the seven stage two‑stage scheme and can only adopt a dual cylinder design.Based on the medium hub‑tip ratio model stage of a double‑cylinder gas storage compressor，the design and development of a high hub‑tip ratio model stage has been completed by combining the forward design method，automatic optimization method and test method.The geometry，macroscopic performance，and internal flow field characteristics of different hub‑tip ratio model stages were also compared and analyzed，and it revealed the flow characteristics of the high hub‑tip ratio model stage.The study shows that the polytropic efficiency of the 0.46 high hub‑tip ratio model stage is 4.3% lower than that of the 0.39 hub‑tip ratio model stage，and the efficiency drop of the impeller part is the largest，accounting for 67.4% of the efficiency drop of the whole model stage.Adjusting the blade profile，the number of blades，and reducing the Mach number inside the impeller and the bladeless diffuser have a greater potential to improve the efficiency of the model stage.The deviation of the efficiency between the CFD and the experimental results is all within 3%，which has strong reference value.The developed model stage hub ratio has been increased by 18%，which solves the rotor stability problem of the seven‑stage two‑section scheme and realizes the design and development of a single‑cylinder gas storage compressor with a small floor area.This study addresses the stability issues of single‑cylinder seven‑stage two‑stage rotors，and fills the research gap in the application of large wheel hub ratio compressors in China，and provides valuable reference significance for the aerodynamic design，development and application of the high hub‑tip ratio model of centrifugal compressors.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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